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1. Edit the prometheus.service file

   Code Block
   vi /usr/lib/systemd/system/prometheus.service

2. Change the value of “--storage.tsdb.retention.time=15d" below to "ExecStart=/usr/local/bin/prometheus \" line.
   The config will look like below for 45 days of data retention. (e.g. 1 year: 1y or 365d)

   Code Block

   # /etc/systemd/system/prometheus.service [Unit] Description=Prometheus Server Documentation=https://prometheus.io/docs/introduction/overview/ After=network-online.target [Service] User=prometheus Restart=on-failure ExecStart=/usr/local/bin/prometheus \ --config.file=/etc/prometheus/prometheus.yml \ --storage.tsdb.path=/var/lib/prometheus/data \ --storage.tsdb.retention.time=45d \ --web.console.templates=/etc/prometheus/consoles \ --web.console.libraries=/etc/prometheus/console_libraries [Install] WantedBy=multi-user.target

NOTE: Ensure that the unit of time is correctly specified. For instance:
- ‘m' for minutes
- ‘h’ for hours
- ‘d' for days
- 'y’ for years

3. Reload systemd manager configuration

   Code Block
   systemctl daemon-reload

4. Restart Prometheus service

   Code Block
   systemctl restart prometheus

See the Prometheus documentation.